/
ssrModuleLoader.ts
187 lines (165 loc) · 4.87 KB
/
ssrModuleLoader.ts
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import fs from 'fs'
import path from 'path'
import { ViteDevServer } from '..'
import { cleanUrl, resolveFrom, unwrapId } from '../utils'
import { rebindErrorStacktrace, ssrRewriteStacktrace } from './ssrStacktrace'
import {
ssrExportAllKey,
ssrModuleExportsKey,
ssrImportKey,
ssrImportMetaKey,
ssrDynamicImportKey
} from './ssrTransform'
import { transformRequest } from '../server/transformRequest'
interface SSRContext {
global: NodeJS.Global
}
type SSRModule = Record<string, any>
const pendingModules = new Map<string, Promise<SSRModule>>()
export async function ssrLoadModule(
url: string,
server: ViteDevServer,
context: SSRContext = { global },
urlStack: string[] = []
): Promise<SSRModule> {
url = unwrapId(url)
if (urlStack.includes(url)) {
server.config.logger.warn(
`Circular dependency: ${urlStack.join(' -> ')} -> ${url}`
)
return {}
}
// when we instantiate multiple dependency modules in parallel, they may
// point to shared modules. We need to avoid duplicate instantiation attempts
// by register every module as pending synchronously so that all subsequent
// request to that module are simply waiting on the same promise.
const pending = pendingModules.get(url)
if (pending) {
return pending
}
const modulePromise = instantiateModule(url, server, context, urlStack)
pendingModules.set(url, modulePromise)
modulePromise.catch(() => {}).then(() => pendingModules.delete(url))
return modulePromise
}
async function instantiateModule(
url: string,
server: ViteDevServer,
context: SSRContext = { global },
urlStack: string[] = []
): Promise<SSRModule> {
const { moduleGraph } = server
const mod = await moduleGraph.ensureEntryFromUrl(url)
if (mod.ssrModule) {
return mod.ssrModule
}
const result =
mod.ssrTransformResult ||
(await transformRequest(url, server, { ssr: true }))
if (!result) {
// TODO more info? is this even necessary?
throw new Error(`failed to load module for ssr: ${url}`)
}
const ssrModule = {
[Symbol.toStringTag]: 'Module'
}
Object.defineProperty(ssrModule, '__esModule', { value: true })
const isExternal = (dep: string) => dep[0] !== '.' && dep[0] !== '/'
await Promise.all(
result.deps!.map((dep) => {
if (!isExternal(dep)) {
return ssrLoadModule(dep, server, context, urlStack.concat(url))
}
})
)
const ssrImportMeta = { url }
const ssrImport = (dep: string) => {
if (isExternal(dep)) {
return nodeRequire(dep, mod.file, server.config.root)
} else {
return moduleGraph.urlToModuleMap.get(unwrapId(dep))?.ssrModule
}
}
const ssrDynamicImport = (dep: string) => {
if (isExternal(dep)) {
return Promise.resolve(nodeRequire(dep, mod.file, server.config.root))
} else {
// #3087 dynamic import vars is ignored at rewrite import path,
// so here need process relative path
if (dep.startsWith('.')) {
dep = path.posix.resolve(path.dirname(url), dep)
}
return ssrLoadModule(dep, server, context, urlStack.concat(url))
}
}
function ssrExportAll(sourceModule: any) {
for (const key in sourceModule) {
if (key !== 'default') {
Object.defineProperty(ssrModule, key, {
enumerable: true,
configurable: true,
get() {
return sourceModule[key]
}
})
}
}
}
try {
new Function(
`global`,
ssrModuleExportsKey,
ssrImportMetaKey,
ssrImportKey,
ssrDynamicImportKey,
ssrExportAllKey,
result.code + `\n//# sourceURL=${mod.url}`
)(
context.global,
ssrModule,
ssrImportMeta,
ssrImport,
ssrDynamicImport,
ssrExportAll
)
} catch (e) {
const stacktrace = ssrRewriteStacktrace(e.stack, moduleGraph)
rebindErrorStacktrace(e, stacktrace)
server.config.logger.error(
`Error when evaluating SSR module ${url}:\n${stacktrace}`,
{
timestamp: true,
clear: server.config.clearScreen
}
)
throw e
}
mod.ssrModule = Object.freeze(ssrModule)
return ssrModule
}
function nodeRequire(id: string, importer: string | null, root: string) {
const mod = require(resolve(id, importer, root))
const defaultExport = mod.__esModule ? mod.default : mod
// rollup-style default import interop for cjs
return new Proxy(mod, {
get(mod, prop) {
if (prop === 'default') return defaultExport
return mod[prop]
}
})
}
const resolveCache = new Map<string, string>()
function resolve(id: string, importer: string | null, root: string) {
const key = id + importer + root
const cached = resolveCache.get(key)
if (cached) {
return cached
}
const resolveDir =
importer && fs.existsSync(cleanUrl(importer))
? path.dirname(importer)
: root
const resolved = resolveFrom(id, resolveDir, true)
resolveCache.set(key, resolved)
return resolved
}